King Grub
2010-08-07, 13:04
PURPOSE:: To investigate the influence of pacing strategy on pulmonary V o2 kinetics and performance during high-intensity exercise.
METHODS:: Seven males completed 3-min and 6-min bouts of cycle exercise on three occasions with the bouts initiated using an even-start (ES; constant-work-rate), fast-start (FS) or slow-start (SS) pacing strategy. In all conditions, subjects completed an all-out sprint over the final 60 s of the test as a measure of performance.
RESULTS:: For the 3-min exercise bouts, the mean response time (MRT) for the V O2 kinetics over the pacing phase was shortest in FS (35 +/- 6 s), longest in SS (55 +/- 14 s) and intermediate in ES (41 +/- 10 s), (P<0.05 for all comparisons). For the 6-min bouts, the V o2 MRT was longer in SS (56 +/- 15 s) than in FS and ES (38 +/- 7 and 42 +/- 6 s, respectively; P<0.05). The V o2 at the end of exercise was not different from the V O2max during the 6 min exercise bouts or 3-FS but was lower than V O2max for 3-ES and 3-SS (P<0.05). The end-sprint performance was significantly enhanced in 3-FS compared to 3-ES and 3-SS (mean power: 374 +/- 68 vs. 348 +/- 61 and 345 +/- 71 W, respectively; P<0.05). However, end-sprint performance was unaffected by pacing strategy in the 6-min bouts.
CONCLUSIONS:: These data indicate that a FS pacing strategy significantly improves performance during 3-min bouts of high-intensity exercise by speeding V O2 kinetics and enabling the attainment of V O2max.
Med Sci Sports Exerc. 2010 Aug 2. A Fast-Start Strategy Improves VO2 Kinetics and High-Intensity Exercise Performance.
METHODS:: Seven males completed 3-min and 6-min bouts of cycle exercise on three occasions with the bouts initiated using an even-start (ES; constant-work-rate), fast-start (FS) or slow-start (SS) pacing strategy. In all conditions, subjects completed an all-out sprint over the final 60 s of the test as a measure of performance.
RESULTS:: For the 3-min exercise bouts, the mean response time (MRT) for the V O2 kinetics over the pacing phase was shortest in FS (35 +/- 6 s), longest in SS (55 +/- 14 s) and intermediate in ES (41 +/- 10 s), (P<0.05 for all comparisons). For the 6-min bouts, the V o2 MRT was longer in SS (56 +/- 15 s) than in FS and ES (38 +/- 7 and 42 +/- 6 s, respectively; P<0.05). The V o2 at the end of exercise was not different from the V O2max during the 6 min exercise bouts or 3-FS but was lower than V O2max for 3-ES and 3-SS (P<0.05). The end-sprint performance was significantly enhanced in 3-FS compared to 3-ES and 3-SS (mean power: 374 +/- 68 vs. 348 +/- 61 and 345 +/- 71 W, respectively; P<0.05). However, end-sprint performance was unaffected by pacing strategy in the 6-min bouts.
CONCLUSIONS:: These data indicate that a FS pacing strategy significantly improves performance during 3-min bouts of high-intensity exercise by speeding V O2 kinetics and enabling the attainment of V O2max.
Med Sci Sports Exerc. 2010 Aug 2. A Fast-Start Strategy Improves VO2 Kinetics and High-Intensity Exercise Performance.